6533b7d3fe1ef96bd126101b
RESEARCH PRODUCT
Copolymerization of Vinylidene Fluoride and Acrylic Acid in Supercritical Carbon Dioxide
Vanessa FirettoOnofrio ScialdoneGiuseppe SilvestriAlberto SpinellaAlessandro Galiasubject
copolymerizationsupercritical fluidacrylic acidfluoropolymervinylidene fluorideSettore ING-IND/27 - Chimica Industriale E Tecnologicamembraneradical polymerizationfreeradical copolymerizationdescription
The free-radical copolymerization of vinylidene fluoride (VDF) and acrylic acid (AA) was carried out in supercritical carbon dioxide using both precipitation and dispersion techniques in the presence of an ammonium carboxylate perfluoropolyether compound. Formation of a copolymer was confirmed by variable contact time CP MAS NMR spectroscopy. Macromolecular matrices were significantly enriched in AA with respect to the initial feed composition and we found that the nonfluorinated monomer has a much higher reactivity ratio with respect to VDF. The cumulative concentration, crystallinity, and water affinity of the synthesized copolymers could be modified changing the initial feed composition, the density of the polymerization mixture, the specific interfacial area of the polymer phase, and the polymerization time. The solubility of the macromolecular product in water was greatly affected by its composition.
year | journal | country | edition | language |
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2010-01-01 |